TEG: sorry to hear the news. Don't let this disappointment set you back. Sounds like you have a plan and I encourage you to attack with intensity.
As a reference for others that may find one way blocked I wanted to provide the following:
https://www.trngcmd.usmc.mil/OCS/Lists/Commissioning Sources/AllItems.aspx
"There are multiple ways to earn a commission as a United States Marine Officer. The only Marine officers who are commissioned and do not graduate from Officer Candidates School are appropriately screened and evaluated at the United States Naval Academy. All other Marine officers graduate from one of four officer training programs held at Brown Field, the home of Marine Corps Officer Candidates School. Below are the basics of the four programs:
Officer Candidates Course (OCC) is a 10-week commissioning program for those who already hold a bachelor's degree from an accredited institution. OCC classes are held three times a year, in fall, winter, and summer.
Platoon Leaders Class (PLC) is either two 6-week programs called PLC Juniors and Seniors or a single 10-week program called PLC Combined in which undergraduate college students attend OCS during their summer break. Candidates cannot enroll in PLC Seniors without succesfully completing the Juniors course. Upon successful completion of OCS, these officer candidates return to their respective colleges to finish their degree requirements before receiving a commission.
Naval Reserve Officer Training Corps (NROTC) is a scholarship program that provides money for college in return for a commitment to serve at least four years as an active duty Marine Officer. NROTC students receive various classes on Naval Science during the course of their four year college program and attend OCS the summer prior to their senior year. NROTC Marine Option students must successfully complete a 6-week program at OCS to be commissioned as Marine Officers.
Enlisted to Officer Commissioning Programs:
Enlisted Commissioning Program (ECP) provides those enlisted Marines who already hold a bachelor's degree the opportunity to commission. Qualified Marines attend OCS and commission upon successful completion of the program.
Meritorious Commissioning Program (MCP) provides enlisted Marines with an associate's degree or 75 semester credit hours the opportunity to commission. Qualified Marines attend OCS and commission upon successful completion of the program and earning their bachelor's degree.
Marine Corps Enlisted Commissioning Educational Program (MECEP) provides outstanding enlisted Marines who do not yet have their degree the opportunity to become Marine Officers. Applying Marines must be active duty of the rank of Cpl or above. If accepted, they will attend a college with an NROTC program and commission upon completion of a 6-week program at OCS and earning their bachelor's degree. NROTC midshipmen and MECEP Marines attend the same training program.
For more information, talk to your local Officer Selection Officer at your Marine Corps Recruiting Station, your Career Retention Specialist, or visit
http://officer.marines.com/ "